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How to Evaluate an Abnormal APTT
Step 1: Is the PT or APTT Artifactually Prolonged?
Step 2: Is
Step 1: Is the PT ... or APTT Artifactually ... Prolonging the PT ... to identify the cause ... of Prolonged APTT
Bleeding and Bruising - Disorders of Hemostasis - Differential Diagnosis Framework

== Quantitative or Qualitative defect in
/NORMAL PTT: • ... Perform a PTT mixing ... /NORMAL PTT: Suggests ... prolonged after ... discern these causes
Hemophilia - Diagnosis and Management
Diagnosis:
 • Consistent bleeding history (unless screening for disease in family members
established disease) • aPTT ... is prolonged, but ... corrects with a mixing ... study (aPTT may ... ) • PT/INR & von